“Conservation of Cultural Heritage< does not only refer to the protection of physical and historical properties of heritage sites, but also to the improvement and reorganization of the environment and of the life of local communities impacted by tourism and globalization. How to preserve the physical heritage (traditional dwellings, historical buildings, bazaar, landscapes, etc.) and keep the intangible cultural heritage (customs, lifestyle, arts and crafts, etc.) growing will be a decisive issue. This paper focuses on the improvement and reorganization of vernacular spaces (especially in residential area and commercial area) of historical city “Bergama<, Turkey after listed as the world cultural heritage on 2014. Bergama, known in ancient times as Pergamon, is a historical and cultural settlement located in the northwest of the Aegean region harboring rich Hellenistic, Roman, Byzantine and Ottoman archaeological remains. This paper aims to analyze the transformation faced in the core zone which is consisted of the historical buildings in residential area and Bazaar called “Arasta< through not only spatial study but also function and utilize of the space. Then, the techniques and skills adapted method for sustainable life and tourism are discussed and shared as the result of this study. *This research is supported by Grant-in-Aid for Scientific Research (KAKENHI26820264).